Navigation Links
Manatee hearing good enough to sense approaching motorboats
Date:4/11/2012

st was about to start, the team then trained the manatees to touch a yellow response paddle in return for a tasty fruit or vegetable snack when they heard a sound. They also trained the manatees to stay in place (in return for another snack) when they heard nothing. Once Hugh and Buffett had got the task in hand, the team tested their hearing by selecting a particular sound frequency (pitch) and gradually lowering the volume of the sound until the manatee could no longer hear it. Plotting these 'hearing thresholds' on a graph, the team could see that the manatees had good hearing between 8 and 32kHz and could even hear sounds as low as 0.25kHz so long as they were quite loud. However, they were even more amazed when Buffett appeared to be able to hear ultrasonic frequencies as high as 90.5kHz. 'Buffett did the task but refused to continue after the first round at that frequency, so we think it was aversive or annoying', Gaspard recalls.

Intrigued by the manatees' apparently sensitive hearing, the team then tested how well the mammals performed when the sounds were accompanied by background noise. Playing test tones ranging from 4 to 32kHz against background noise centered on the same pitch, the team recorded the difference between the volume of the tone and background noise when the manatee could no longer distinguish the tone. Plotting the critical ratio the level at which the background noise swamped the manatee's hearing against pitch for each animal, the team saw that the manatees struggled to hear lower and higher pitched sounds above background noise. However, their hearing was much sharper at 8kHz the frequency at which manatees communicate where they could still distinguish tones that were only 18.3dB louder than the background.

So, it appears that manatees should be able to hear approaching motorboats above background noise but it's much more difficult to know whether manatees can always focus on these sounds in nature, Gaspard say
'/>"/>

Contact: Kathryn Knight
kathryn@biologists.com
44-787-634-4333
The Company of Biologists
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Manatee subspecies genetically confirmed, but diversity challenge looms
2. Manatees can probably hear which directions boats approach from
3. Specialization for underwater hearing by the tympanic middle ear of the turtle
4. Teaching about hearing can save young peoples ears
5. 50 million year old cricket and katydid fossils hint at the origins of insect hearing
6. Is there a central brain area for hearing melodies and speech cues? Still an open question
7. Bats show ability to change their ear shapes, making their hearing more flexible
8. Diagnosing hearing loss at a fraction of the time and cost
9. Ancient whale skulls and directional hearing: A twisted tale
10. Study finds new role for protein in hearing
11. For hearing parts of brain, deafness reorganizes sensory inputs, not behavioral function
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/28/2014)... MD FASEB MARC (Maximizing Access to Research Careers) ... American Society of Human Genetics from October 18 ... are meant to promote the entry of students, post ... of the basic science community and to encourage the ... Human Genetics. This year MARC conferred 16 awards ...
(Date:8/28/2014)... MINNEAPOLIS/ST. PAUL (August 28, 2014) Researchers at the ... for facioscapulohumeral muscular dystrophy (FSHD) to be used for ... effectiveness of potential therapies for FSHD. , The research ... Cell Reports . , There is no treatment ... the most common type of muscular dystrophy. FSHD is ...
(Date:8/28/2014)... peer groups and clinicians is critical to the ... University of Georgia research. , A qualitative study ... determined that role models for successful breastfeeding help ... , "Mothers who received that support are more ... co-author Alex Anderson, an associate professor in the ...
Breaking Biology News(10 mins):UMN researchers find animal model for understudied type of muscular dystrophy 2Breastfeeding study shows need for effective peer counseling programs 2
... from the food industry are excellent sources of proteins ... However, at the moment these side streams are mainly ... end up as waste. Coordinated by VTT, the ... containing industrial co-streams) project seeks to enrich several co-stream ...
... is no scientific evidence that low-level electromagnetic field ... causes adverse health effects, according to a report ... the Committee provides advice to authorities about risk ... has assessed the health hazards from low-level electromagnetic ...
... Mass. and COLUMBIA, S.C., Sept. 17, 2012   Eliza Corporation ... engagement management, and BlueCross BlueShield of South Carolina ... rates for BlueCross members increased 45 percent over 2011 ... 2012 program have exceeded expectations in all areas, and ...
Cached Biology News:Food industry's high-quality co-streams used effectively as raw material for new products 2Mobile phones and wireless networks: No evidence of health risk found 2Mobile phones and wireless networks: No evidence of health risk found 3Mobile phones and wireless networks: No evidence of health risk found 4Eliza Corporation and BlueCross BlueShield of South Carolina Drive Awareness and Healthier Behavior to Increase Colorectal Cancer Screenings by 45 Percent 2Eliza Corporation and BlueCross BlueShield of South Carolina Drive Awareness and Healthier Behavior to Increase Colorectal Cancer Screenings by 45 Percent 3Eliza Corporation and BlueCross BlueShield of South Carolina Drive Awareness and Healthier Behavior to Increase Colorectal Cancer Screenings by 45 Percent 4
(Date:8/28/2014)... 2014   SunTrust Robinson Humphrey (STRH) ... to its equity research team in biotechnology and ... in equity research demonstrates our commitment to providing ... enhance their investment decision making," said Biff ... continue to make significant investments in differentiated content ...
(Date:8/28/2014)... , Aug. 28, 2014  Armetheon, Inc. ... developing novel mid- to late-stage cardiovascular drug candidates, ... in its first round of financing. The Series ... and Hercules Bioventures with participation from investors that ... pharmaceutical executive, Dr. Larry Hsu , the ...
(Date:8/28/2014)... Scientists, researchers, and technologists will converge ... Damage 2014 symposium. Marking its 46th year, the ... run 14-17 September. The event is sponsored by ... , The premier conference for basic and applied issues ... materials will engage researchers and engineers from numerous industries ...
(Date:8/28/2014)... Earlier this month, a report was created by ... Air Force on the performance of vehicles using an ... of fuel made from mustard seeds, offered great potential ... Eco friendly future. In fact, every branch of the ... of foreign oil over the next few years. They ...
Breaking Biology Technology:SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 2SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 3Armetheon Completes $7.0 Million Series A Financing 2Armetheon Completes $7.0 Million Series A Financing 3Laser Damage to Draw Researchers, Engineers, Scientists to 46th Annual Conference 2Laser Damage to Draw Researchers, Engineers, Scientists to 46th Annual Conference 3Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 2Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 3Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 4Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 5
... XIANYANG, China, May 17 /PRNewswire-Asia-FirstCall/ -- Biostar,Pharmaceuticals, Inc. ... manufacturer of a leading over-the-counter Hepatitis B medicine, Xin,Aoxing Oleanolic ... announced financial results of the first quarter ended March,31, ... revenue increased 66.0% to $12.4 million, -- ...
... 17 Soligenix, Inc. (OTC Bulletin Board: SNGX) (Soligenix or the ... first quarter of 2010. , ... Soligenix,s revenues for the first quarter of 2010 were approximately ... of 2009. The decreased revenues were primarily a result of decreases in ...
... and MELVILLE, N.Y. May 16 ... Pharmaceuticals, Inc. (Nasdaq: OSIP ), a biotechnology company primarily focused ... medical needs in oncology, diabetes and obesity, today announced that they ... acquire OSI. , , ...
Cached Biology Technology:Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 2Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 3Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 4Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 5Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 6Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 7Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 8Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 9Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 10Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 11Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 12Biostar Pharmaceuticals, Inc. Announces First Quarter 2010 Financial Results 13Soligenix Reports First Quarter 2010 Financial Results and Reviews Accomplishments 2Soligenix Reports First Quarter 2010 Financial Results and Reviews Accomplishments 3Soligenix Reports First Quarter 2010 Financial Results and Reviews Accomplishments 4Soligenix Reports First Quarter 2010 Financial Results and Reviews Accomplishments 5Astellas Pharma Inc. to Acquire OSI Pharmaceuticals, Inc. 2Astellas Pharma Inc. to Acquire OSI Pharmaceuticals, Inc. 3Astellas Pharma Inc. to Acquire OSI Pharmaceuticals, Inc. 4Astellas Pharma Inc. to Acquire OSI Pharmaceuticals, Inc. 5Astellas Pharma Inc. to Acquire OSI Pharmaceuticals, Inc. 6
... consists of an anodized aluminum body in ... Compounds embedded in polymerized matrix. It is ... and Synergy Multi-Detection Readers. This multi-functional test ... reducing the need for tedious wet testing. ...
... Safe DNA Gel Stain combo offers these benefits: ... same products separately Offers ... Eliminates risks to yourself, the ... fragments from 100 bp to >30 kb. UltraPure Agarose ...
... economical ICS-90 uses continuous chemical suppression and ... you fast, accurate determinations of common anions ... to operate, quick to equilibrate, and fully ... ICS-90 helps you achieve maximum sample throughput ...
... DNA Gel Stain combo offers these benefits: ... products separately Offers a ... Eliminates risks to yourself, the environment ... from 100 bp to >30 kb. UltraPure Agarose is ...
Biology Products: